Error: Output refers to resource that no longer exists

Workarounds

1. 95% success Remove or update the output block to reference existing resources

   # Check what resources exist:
   terraform state list
   
   # Update the output to reference an existing resource:
   output "instance_ip" {
     value = aws_instance.web.public_ip  # must exist in state
   }
   
   # Or remove the output if the resource was deleted:
   # Delete the output block from .tf files

   Sources: https://developer.hashicorp.com/terraform/language/values/outputs

2. 85% success If the output is consumed by other modules, coordinate the removal

   # Check which modules consume this output:
   grep -r 'module.<module_name>.output_name' *.tf
   
   # Update consumers before removing the output:
   # 1. In the child module: keep the output temporarily
   # 2. In parent modules: update references to new source
   # 3. Run terraform plan to verify no breakage
   # 4. Then safely remove the output

   Sources: https://developer.hashicorp.com/terraform/language/values/outputs